Question:
Acetaldehyde is more reactive than acetone towards addition of HCN.
Acetaldehyde is more reactive than acetone towards addition of HCN.
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In semicarbazide, the reaction occurs via the available -NH₂ group attached to the carbonyl. Aldehydes are generally more reactive than ketones due to their less hindered electron distribution.
Updated On: Oct 12, 2025
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Solution and Explanation
Acetaldehyde is more reactive than acetone towards HCN addition because acetaldehyde has a smaller electron-donating alkyl group (-CH₃) compared to acetone, making its carbonyl carbon more electrophilic and susceptible to nucleophilic attack by HCN.
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